Mail Archives: pgcc/1999/07/11/12:45:58
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On Fri, 9 Jul 1999, Henrik Berglund SdU wrote:
> When i remove -lm in the bytemark makefile on my k6-2 running linux and
> pgcc it does not complain about not finding (sin, cos, exp, sqrt, pow).
> but it does so on an ultrasparc running solaris. What is wrong does pgcc
> always include the math library by default?
as far as I know, pgcc (and gcc) include a set of functions directly
integrated in them. These include stuff like memmove, memcpy, etc. and
also they use the built-in FPU of the (at least Intel) processors. This
means that pgcc does not actually use library function to evaluate, say
cos, but it executes the FPU instruction to compute it instead. I do not
know much about the UltraSparc, yet I do not believe it includes these
math functions, so you have to link the math library to do the work.
>
> Have a 3dnow library that i would like to try, it has some optimised cos
> sin sqrt funktions.
I do not think that you can optimize these functions more than to execute
a single instruction in the FPU.
>
> -----------------------------------------------------------------------------
> Henrik DOT Berglund AT mds DOT mdh DOT se
> http://www.mds.mdh.se/~adb94hbd/
>
>
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